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Brake Pedal Goes to Floor When Engine Running [Reasons and the way to Fix]

One of the worst moments ever is once you press the foot lever, and you discover that the foot lever goes to the ground when the engine is running at high speed. This example is both bad as well as dangerous. This further discourages people from driving a car without the brakes effective use of brakes.

In case you realize that the brakes have begun to weaken or have any strange sound, make sure the vehicle is checked as soon as possible. We shall know why we will have a spongy foot lever during this article when the engine is running and repair it to possess full power brakes.

brake pedal goes to floor

What Causes Pedal Goes to Floor When Engine Running

Loss of the Brake Fluid

Brake fluid may be a vital thing about increasing or sustaining a high brake power. Because the driver depresses the foot lever, the pedal compresses the piston within the master cylinder. This compression increases pressure within the brake lines making the brake fluid particles move to the brake caliper. Thanks to the brake fluid’s air mass, the constraint move and squeeze into the brake rotor.

This ends up in friction, which makes the car prevent. So what happens if there’s a brake fluid leakage within the brake lines? During this case, there won’t be any pressure within the pedal. Therefore, the treadle suddenly goes to the ground, and the car won’t stop or make a slight deceleration.

spongy brake pedal

Bad Brake Hydraulic Brake Cylinder

The foot pedal push should feel firm under your leg in normal circumstances since it’s connected to the brake cylinder with a push rod. The brake cylinder generates hydraulic pressure to activate brakes and pushes the brake fluid to the front and rear wheels.

The cylinder must be sealed to stay pressure and power, that pushes the brake fluid to the calipers. Therefore, if the rubber seals that keep the brake fluid inside are worn–out or get torn, it’ll cause internal leaking, which finally causes the spongy feel under your leg.

brake pedal soft

Bad Brake Booster

If the foot pedal goes to the ground but still stops, you’ll be having a failed brake power booster. The ability booster’s role within the braking process is giving power assistance when the driving force depresses the pedal. This suggests that you don’t need to make a high amount of power to prevent the car. The brake booster is situated between the cylinder and treadle and connected to the engine.

It uses a vacuum line to beat fluid pressure within the braking system. When the brake booster is faulty, you may feel that the stopping distance is increased. The pedal goes all the thanks to the ground to prevent the car completely. This happens because you’re not getting the sufficient power boost required to avoid the vehicle.

brakes pedal soft

Presence of Air in Brake Lines

Many drivers have reported that the pedal goes to the ground after the new cylinder replacement. This usually happens if no air bleeding was done after installing a replacement hydraulic brake cylinder, and thus there’s air within the brake lines. The air stops the brake fluid from efficient flow inside the brake lines, damaging the brake lines and giving a spongy soft feel rather than the foot pedal’s firm feel when depressing.

brake pedal goes to floor sometimes

How does one Fix foot lever Goes to Floor When Engine Running

Although having your treadle goes to the ground when the engine running is terrible and dangerous, it’s very noticeable and straightforward to diagnose. This fault doesn’t involve many parts of the braking system. To repair this problem, start diagnosing the fault well:

Brake Lines, Brake Calipers Check:

The primary thought that involves anyone’s mind when the pedal goes to the ground when the engine is running is that there’s a leakage in any of the brake lines outflow the pressure within the brakes. The primary thing you need is to test the brake fluid level. If it’s total capacity, then there’s no leak. If otherwise, you’ve got a leakage somewhere.

soft brake pedal no leaks

In case there’s leakage, make a watch check on the four wheels to determine if there’s any oil residue on one in all. Then keep an eye on the brake fluid lines themselves to work out if one among them contains a hole or something. At last, Finalize by replacing the defective part and top up the brake fluid level.

Check Brake Master Cylinder:

The following check to perform is the brake hydraulic brake cylinder since it’s some seals to closure oil inside. As we stated within the previous section, these seals may wear with time thanks to the car’s age, causing brake fluid to leak. During this case, the hydraulic brake cylinder should get replaced with a replacement one.

Try not to install a fresh one and not a rebuilt one. A second-hand cylinder won’t last long. It’s going to work well for a start but get weaker by the time.

Frequently Asked Questions (FAQs)

Q: Why Do I Lose Brake Pressure once I Start My Car?

Once you lose brake pressure after starting your car if you’ve got a leakage in any of the brake components. If the pedal goes to the ground but no leaks, the matter may be associated with the brake booster that encompasses a vacuum leakage.

Q: What will make me realize that If My Brake Booster or brake cylinder Is Bad?

There are many ways to spot a nasty brake cylinder or brake booster. You’ll be able to feel brakes are so spongy or very soft under your leg, or there’s a leakage within the hydraulic brake cylinder. You’ll also think that the treadle is difficult to press, or the engine is stalling and finish off while braking. Of these are signs of a nasty brake booster or brake cylinder.

Q: Why Does My foot pedal move to the ground After Bleeding?

In case bleeding the air out of the brake fluid, you need to make some hard pressings on the brakes to retain the pressure back to the brake lines.

Q: Should brakes be bled with the engine running?

Bleed brakes (at the calipers) with the engine off. The sole pump that runs would be for the ABS. If you’re trying to bleed that system (ABS), you’d have to make the pump run; if you’re bleeding the bottom brakes, you’d not need the pump to run.

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